Incoming mail returned to sender with error: Too Many Headers Message looping occurring when the a message is sent back to the default domain generating an error "TOO MANY HEADERS"

This is a looping problem as MailSite attempts to deliver the message to the default domain.  MailSite thinks that the domain to which the message is addressed is remote and attempts to send the message outwards.  The DNS record for this domain points to the IP address of the local server and so MailSite delivers the message back to itself. 

Solution:  Rename the Default Domain or add a Wildcard Alias

To fix this problem, you should rename your Default Domain:

• Startup the MailSite Console
• Open the properties for your MailSite server
• Select the Domains tab
• Select the Default Domain    (with the red dot)
• Click on the Right Mouse Button
• Select:  Rename
• Type:  abc.com (where abc.com is your domain name)
• The Default Domain should match the domain part of your e-mail address:
• joe@abc.com

If you would prefer to retain the current Default Domain name, you can add a wildcard alias:

• Startup the MailSite Console
• Open the properties for your MailSite server
• Select the Aliases tab
• In Map From type:  *@abc.com   (where abc.com is your domain name)
• In Map To type:  *@mail.abc.com  (where mail.abc.com is the current Default Domain)